Suppressive effect of rice bran incorporation in paddy soil on germination of Monochoria vaginalis and its relationship with electric conductivity(Soil fertility)

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概要

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• Laboratory experiments were conducted to investigate (1) the effects of the addition of rice (Oryza sativa. L.) bran to paddy soil on the germination of Monochoria vaginalis (Burm. f.) Kunth, and (2) the relationship between the electric conductivity (EC) of the soil solution and germination. Soil samples were collected at 4 sites in Japan. After flooded soils with rice bran had been incubated for 7d at 30℃, the soil solution was collected using a porous cup and the EC of the soil solution was measured. The amounts of rice bran added to the soil were 0%, 0.3%, 0.6% and 0.9% (weight(w)/w). In the soil solution obtained, seeds of M. vaginalis were incubated for 3d at 30℃, and the germination percentage was then analyzed. The addition of rice bran suppressed germination, and the degree of suppression increased with increasing content of rice bran. Although the same amount of rice bran was applied to each soil, the degree of growth suppression by rice bran as well as the EC of the soil solution differed among the soils. In each soil, there was a positive correlation between the amount of rice bran and EC, and the degree of growth suppression significantly increased with an increase in EC. When EC was higher than 150mSm^<-1>, seeds of M. vaginalis hardly germinated. There was no significant correlation between the oxidation-reduction potential (Eh) of soil and seed germination, suggesting that EC is a more reliable and convenient indicator than Eh for evaluating the relationship between the addition of organic material and seed germination. In conclusion, the addition of rice bran to soil increases the EC of the soil solution, and EC is one of the factors that suppress the germination of M. vaginalis. The suppressive effect of rice bran on germination is different among soils. This fact is attributed to the difference in EC due to the addition of rice bran. Thus, it is expected that EC can be used as an indicator for determining how much rice bran to add.

• 2012-04-00

著者

• UCHINO Akira

  National Agricultural Research Center

• Uchino Akira

  National Agricultural Res. Center Tsukuba Jpn

• YOSHIDA Shuichi

  Miyagi Prefectural Furukawa Agricultural Experiment Station

• OKAWA Shigenori

  Miyagi Prefectural Furukawa Agricultural Experiment Station

• NOZOE Takuhito

  National Agricultural Research Center

• KANDA Yukihide

  Mie Prefecture Agricultural Research Institute

• NAKAYAMA Yukinori

  Mie Prefecture Agricultural Research Institute

• KANDA Yukihide

  Mie Prefecture Agricultural Research Institute:(Present office)Mie Prefecture Ise Agriculture Forestry, Fishery, Commerce Industry and Environment Office

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• Suppressive effect of rice bran incorporation in paddy soil on germination of Monochoria vaginalis and its relationship with electric conductivity(Soil fertility)
• Suppressive effect of rice bran incorporation in paddy soil on germination of Monochoria vaginalis and its relationship with electric conductivity

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